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Method and device for measuring high polymer molten volume flow

A measuring device and volume flow rate technology, which is applied in the field of polymer rheology, can solve problems such as difficult to predict and estimate the influence of reliability, accurate measurement error of polymer melt volume flow rate, etc., and achieve the elimination of measurement error interference , improve accuracy and precision, calculate simple effects

Active Publication Date: 2011-06-08
浙江博发新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This measurement method has two disadvantages: First, it does not directly measure the volume flow of the fluid in the flow channel. The polymer melt is a compressible fluid, and there will be volume changes when flowing through flow channels of different sizes and under different pressures. , which will introduce a large error to the accurate measurement of the polymer melt volume flow rate
Therefore, it is difficult to predict and estimate the impact of this on the reliability of the volumetric flow rate of the fluid in the channel

Method used

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  • Method and device for measuring high polymer molten volume flow
  • Method and device for measuring high polymer molten volume flow
  • Method and device for measuring high polymer molten volume flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 The measurement of the rheological volume flow rate of a single polymer system

[0041] The high polymer melt volume flow measurement device is characterized in that the measurement device consists of a power mechanism 1 that pushes the high polymer melt into the flow channel, a slit flow channel or a conduit flow channel 4, two pressure sensors 2, 3, and a temperature sensor. Sensor 7, melt outer flow channel 5, loop flow channel 8, temperature and data collection and processing system 6, one end of the slit flow channel or conduit flow channel 4 is connected to the flow channel power mechanism 1, the slit flow channel or conduit flow channel The other end is connected with the melt outer flow channel 5, the outer flow channel is connected with the flow channel power mechanism through the loop flow channel 8, a temperature sensor 7 and a plurality of pressure sensors 2, 3 are set in the slit flow channel or the conduit flow channel, and the temperature sens...

Embodiment 2

[0046] Embodiment 2 The measurement of the rheological volume flow rate of various high polymer blend systems

[0047] Adopt the polymer melt volume flow measuring device of embodiment 1, promote polypropylene (T30S) and linear low-density polyethylene (DFDA-7042) with conical twin-screw (screw diameter 5 / 14mm, screw length 109.5mm) The blend enters a slit channel to measure its volumetric flow rate

[0048] The mass ratio of polypropylene and linear low-density polyethylene is (90 / 10). At a temperature of 190°C, the conical twin-screws rotate in the same direction at a rotation speed of 30r / min, melt and plasticize for 5min, and then push the blended material into the Slit, record the readings of the two pressure sensors and their corresponding times. (The geometric dimensions of the slit flow channel are: width 10mm, height 1.5mm, length 64mm between the two sensors, and the volume of the slit between the two sensors is V=64*1.5*10=960(mm 3 )). The fluid volume flow rate ...

Embodiment 3

[0049] Embodiment 3 The mensuration of the volume flow rate of high polymer and auxiliary agent (stabilizer, lubricant, filler)

[0050] Adopt the high polymer melt volume flow measuring device of embodiment 1, push the polypropylene (T30S), ethylene vinyl acetate copolymer and calcium carbonate with conical twin-screw (5 / 14mm in screw diameter, 109.5mm in length of screw) The mixture enters the slit flow channel to measure its volumetric flow rate

[0051] The mass ratio of polypropylene, ethylene vinyl acetate copolymer and calcium carbonate is (60 / 10 / 30) at 190°C, the conical twin-screws rotate in reverse, the number of revolutions is 40r / min, melt and plasticize for 5min, and then The blended material is pushed into the slit, and the readings from the two pressure sensors and their corresponding times are recorded. (The geometric dimensions of the slit flow channel are: width 10mm, height 1.5mm, length 64mm between the two sensors, and the volume of the slit between the t...

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Abstract

The invention discloses a measuring device for high polymer fusant volume flow and a measuring method thereof. The invention is characterized in that one end of a slit flow passage or a conduit flow passage (4) is connected with a flow passage actuating unit (1), the other end thereof is connected with a fusant external flow passage (5), the external flow passage is connected with the flow passage actuating unit by a loop flow passage (8), the slit flow passage or the conduit flow passage is provided with a temperature sensor (7) and a plurality of pressure sensors (2, 3), and the temperaturesensor and a plurality of pressure sensors are respectively connected with a collecting and processing system (6) for temperature and data. The actuating unit pushes the high polymer fusant to enter the flow passage at a certain speed, and the passing time of fluid is measured by two pressure sensors, therefore, the volume flow of the high polymer in the flow passage can be obtained according to the physical dimension of the flow passage and the passing time. The measuring device of the invention can measure the volume flow of the high polymer fusant in the flow passage without the influence of the change of the pressure and the dimension of the flow passage. In addition, the invention provides a method which can improve and enhance the rheological measurement precision of the high polymer.

Description

Technical field: [0001] The invention relates to a high polymer melt volume flow measuring device and a measuring method thereof, belonging to the field of high polymer rheological measurement. Background technique: [0002] Polymer rheology plays a very important role in polymer molding and processing. In the selection and use of materials, the determination and optimization of processing conditions, the manufacture of processing equipment and the design of molding molds, and the improvement and improvement of product quality, measurement and analysis data of the flow behavior of polymer melts are required. Capillary, slit and rotary rheometers are mainly used in polymer rheological analysis measurements. For rheological measurements of Newtonian fluids, it can be calculated according to the Hagen-Poiseuille equation. [0003] η=π*R 4 *ΔP / (8*Q*L) [0004] η = viscosity of the melt [0005] Q = volumetric flow rate [0006] ΔP = the pressure difference between the two ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/708G01N11/02
Inventor 李文光吴炳田侯世荣王亚
Owner 浙江博发新材料股份有限公司
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